Context

Chronic heart failure (CHF) is common, affecting 1–2% of the population and 10% of people >70 years. Patients with CHF have
an increased risk of thromboembolism. Those with atrial fibrillation (AF) should receive warfarin but whether CHF patients
with sinus rhythm (SR), whose risk is 1.5–3.5%,1 should receive thromboprophylaxis is unclear.